CVE & CISA-KEV Catalog

CVE-2016-9921

MEDIUM
6.5
CVSS v3
NVD

Description

Quick emulator (Qemu) built with the Cirrus CLGD 54xx VGA Emulator support is vulnerable to a divide by zero issue. It could occur while copying VGA data when cirrus graphics mode was set to be VGA. A privileged user inside guest could use this flaw to crash the Qemu process instance on the host, resulting in DoS.

CWE-369

How to fix

Remediation Available
qemuDebian
Fixed in:1:2.8+dfsg-1CVE-2016-9921
Fixed in:1:2.8+dfsg-1CVE-2016-9921
Fixed in:1:2.8+dfsg-1CVE-2016-9921
Fixed in:1:2.8+dfsg-1CVE-2016-9921
qemuUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.33USN-3261-1
Fixed in:1:2.5+dfsg-5ubuntu10.11USN-3261-1
qemu-systemUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.33USN-3261-1
Fixed in:1:2.5+dfsg-5ubuntu10.11USN-3261-1
qemu-system-aarch64Ubuntu
Fixed in:2.0.0+dfsg-2ubuntu1.33USN-3261-1
Fixed in:1:2.5+dfsg-5ubuntu10.11USN-3261-1
qemu-system-armUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.33USN-3261-1
Fixed in:1:2.5+dfsg-5ubuntu10.11USN-3261-1
qemu-system-mipsUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.33USN-3261-1
Fixed in:1:2.5+dfsg-5ubuntu10.11USN-3261-1
qemu-system-miscUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.33USN-3261-1
Fixed in:1:2.5+dfsg-5ubuntu10.11USN-3261-1
qemu-system-ppcUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.33USN-3261-1
Fixed in:1:2.5+dfsg-5ubuntu10.11USN-3261-1
qemu-system-s390xUbuntu
Fixed in:1:2.5+dfsg-5ubuntu10.11USN-3261-1
qemu-system-sparcUbuntu
Fixed in:2.0.0+dfsg-2ubuntu1.33USN-3261-1
Fixed in:1:2.5+dfsg-5ubuntu10.11USN-3261-1
qemu-system-x86Ubuntu
Fixed in:2.0.0+dfsg-2ubuntu1.33USN-3261-1
Fixed in:1:2.5+dfsg-5ubuntu10.11USN-3261-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeChanged

Impact

ConfidentialityNone
IntegrityNone
AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

Exploit Intelligence

0.39%probability of exploitation in 30 days
31stpercentile

Low risk: more likely to be exploited than 31% of all known CVEs.

References

Related Vulnerabilities

Other CWE-369 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2012-0207High7.520%-Fix
CVE-2017-8537Medium5.517%--
CVE-2017-8536Medium5.517%--
CVE-2017-8535Medium5.517%--
CVE-2007-2237Medium5.515%--
CVE-2025-0317High7.513%--
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.